Steel pipe hot expanding device

Abstract

The present application relates to the technical field of steel pipe production and processing, in particular to a steel pipe hot expanding device, which comprises an expanding system, a limiting system and a circulating system, the expanding system comprises a mandrel, a top head, a top rod and an expanding trolley, a receiving chute for placing the top head is arranged in front of the expanding trolley, the top rod is installed on the expanding trolley, the top head is provided with the mandrel at the front end, and the top rod is detachably installed at the rear end of the top head; the limiting system comprises a limiting type drawing trolley and a locking claw connected with the limiting type drawing trolley; the circulating system comprises a conveying roller, a turnover device one and a turnover device two. The steel pipe hot expanding device designed in the present application comprises an expanding system, a limiting system and a circulating system, the whole device is controlled by a mechanical and electrical control system, the limiting type drawing trolley is used to realize the hot expansion of the steel pipe, the existing seamless steel pipe hot expansion technology is innovated, and the production efficiency of the large-diameter seamless steel pipe is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of steel pipe production and processing technology, specifically to a steel pipe thermal expansion device. Background Technology

[0002] Large-diameter seamless steel pipes are mainly used as general fluid pipes, and can be applied in oil and gas pipelines, structural pipes, pressure vessels, and military pipelines. Although current production capacity is large, it still cannot meet the increasing market demand for large-diameter seamless steel pipes year by year. With the development of larger and more efficient equipment in fluid transportation, petrochemical, pressure vessel, and boiler industries, the market demand for large-diameter seamless steel pipes is constantly increasing. Based on this, this invention patent research and design a steel pipe thermal expansion device. Summary of the Invention

[0003] To improve the production efficiency of large-diameter seamless steel pipes, this invention patent research and design a steel pipe thermal expansion device. The entire device includes an expansion system, a limiting system, and a circulation system. The entire device is controlled by a mechanical and electrical control system. The thermal expansion of the steel pipe is achieved by using a limiting-motion pulling trolley. This invention innovates the existing seamless steel pipe thermal expansion technology and effectively improves the production efficiency of large-diameter seamless steel pipes.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a steel pipe hot expansion device, comprising an expansion system, a limiting system, and a circulation system. The expansion system includes a mandrel, a mandrel, a push rod, and an expansion trolley. A receiving trough for placing the mandrel is provided in front of the expansion trolley. The push rod is installed on the expansion trolley. A mandrel is installed at the front end of the mandrel, and a push rod is detachably installed at the rear end of the mandrel. The limiting system includes a limiting-motion pulling trolley and a locking claw connected to the limiting-motion pulling trolley. The locking claw is used to lock one end of the mandrel after the steel pipe is hot expanded. The circulation system includes a conveying roller conveyor, a first turning device, and a second turning device. The first turning device is used to move the mandrel and mandrel onto the conveying roller conveyor after the steel pipe is hot expanded. The conveying roller conveyor is used to transport the mandrel and mandrel to the second turning device. The second turning device is used to move the mandrel and mandrel to the receiving trough in front of the expansion trolley.

[0005] Based on the above technical solution, the present invention can be further improved as follows: As a further improvement to the above technical solution, the pipe expansion system also includes an outer clamp and an inner clamp. The receiving trough, the outer clamp, the inner clamp, and the pipe expansion trolley are set on the workbench. The inner clamp and the outer clamp are used to lock and fix the flared mouth formed after the steel pipe is expanded.

[0006] As a further improvement to the above technical solution, a cooling water pipe is provided on the outer wall of the horn opening.

[0007] As a further improvement to the above technical solution, the mandrel and the push rod are movably connected, the central axis of the mandrel and the central axis of the push rod are collinear, and the rear end of the mandrel is provided with a slot, and the end of the push rod away from the tube expanding trolley is inserted into the slot of the mandrel.

[0008] As a further improvement to the above technical solution, the diameter of the mandrel is smaller than the inner diameter of the steel pipe to be expanded, and the diameter of the mandrel is larger than the outer diameter of the steel pipe to be expanded.

[0009] As a further improvement to the above technical solution, the limited-motion pulling trolley includes a slide, a gear located inside the slide, a limited-motion rack with one end cooperating with the gear, and a motor installed on the outside of the slide; the slide is set on the base, and the other end of the limited-motion rack near the steel pipe to be expanded is fixed with a locking claw; the gear is placed above the limited-motion rack and meshes with the limited-motion rack, and the output shaft of the motor is connected to the gear drive.

[0010] As a further improvement to the above technical solution, the inner side of the slide block is provided with a through groove and a wedge-shaped slide groove. The lower surface of the limiting rack protrudes downward to form a wedge-shaped slide bar. The slide bar extends along the length direction of the limiting rack. One end of the limiting rack enters the through groove of the slide block. The slide bar of the limiting rack is embedded in the slide groove of the slide block, and the slide bar can slide along the slide groove.

[0011] As a further improvement to the above technical solution, a rotating shaft is provided between the receiving trough and the conveying roller conveyor. Tilting device one and tilting device two are connected to both sides of the rotating shaft. Both tilting device one and tilting device two are material-pulling hooks. The conveying roller conveyor includes multiple rollers. Both the conveying roller conveyor and the rotating shaft are driven by a motor. The motor that drives the rotating shaft to rotate is a servo motor. One end of the rotating shaft is connected to the output end of the servo motor through a coupling. When the rotating shaft rotates, it drives tilting device one and tilting device two to rotate.

[0012] The beneficial effects of this invention are as follows: The steel pipe hot expansion device designed by this invention patent includes an expansion system, a limiting system and a circulation system. The entire device is controlled by a mechanical and electrical control system. It uses a limiting-motion pulling trolley to realize the hot expansion of the steel pipe, which innovates the existing seamless steel pipe hot expansion technology and effectively improves the production efficiency of large-diameter seamless steel pipes. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the steel pipe thermal expansion device provided in a preferred embodiment of the present invention; Figure 2 yes Figure 1 Side view of the steel pipe thermal expansion device in the middle; Figure 3 yes Figure 2 A schematic diagram of the expansion system and the steel pipe to be expanded; Figure 4 This is a schematic diagram of the structure of the steel pipe to be expanded, forming a funnel-shaped opening; Figure 5 yes Figure 1 A schematic diagram of the structure of the limited-motion pulling trolley in the middle; In the diagram: 11. Mandrel; 12. Mandrel; 121. Slot; 13. Mandrel rod; 14. Pipe expanding trolley; 15. Outer jaw; 16. Inner jaw; 17. Water pipe; 18. Receiving trough; 21. Limited-motion pulling trolley; 211. Slide seat; 212. Limited-motion rack; 213. Gear; 214. Motor; 215. Through groove; 216. Slide groove; 217. Slide bar; 22. Locking jaw; 31. Conveyor roller; 32. Tilting device one; 33. Tilting device two; 34. Rotating shaft; 41. Base; 42. Steel pipe. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention and therefore only show the components relevant to the present invention.

[0016] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0017] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] like Figures 1 to 5As shown, a preferred embodiment of the present invention provides a steel pipe thermal expansion device, including an expansion system, a limiting system and a circulation system, and the entire device is controlled by a mechanical and electrical control system.

[0019] The tube expanding system includes a mandrel 11, a mandrel 12, a push rod 13, a tube expanding carriage 14, an outer clamp 15, and an inner clamp 16. A receiving trough 18 for placing the mandrel 12 is provided in front of the tube expanding carriage 14. The receiving trough 18, the outer clamp 15, the inner clamp 16, and the tube expanding carriage 14 are arranged on a workbench (not shown). The push rod 13 is mounted on the tube expanding carriage 14. The mandrel 12 is made of non-magnetic stainless steel. The mandrel 11 is installed at the front end of the mandrel 12, and the push rod 13 is detachably installed at the rear end of the mandrel 12. Specifically, as shown... Figure 3 As shown, the top head 12 is movably connected to the top rod 13, and the central axis of the top head 12 is collinear with the central axis of the top rod 13. The rear end of the top head 12 is provided with a slot 121. The end of the top rod 13 furthest from the tube expanding trolley 14 is inserted into the slot 121 of the top head 12. The top head 12 is easily disassembled from the top rod 13 and can be automatically disassembled and assembled. The diameter of the mandrel 11 is slightly smaller than the inner diameter of the steel pipe 42, while the diameter of the top head 12 is larger than the outer diameter of the steel pipe 42, thus serving to expand the diameter. The inner jaw 16 and the outer jaw 15 are used to lock and fix the flared opening formed by the flared steel pipe 42. Preferably, to improve the strength of the locking point of the flared opening of the steel pipe 42, a cooling water pipe 17 is provided on the outer wall of the flared opening for cooling.

[0020] The limiting system includes a limiting-motion pulling carriage 21 and a locking claw 22. The locking claw 22 is used to lock one end of the mandrel 11 after the steel pipe 42 has been heat-expanded. The limiting-motion pulling carriage 21 includes a slide 211, a gear 213 located inside the slide 211, a limiting rack 212 that meshes with the gear 213, and a motor 214 installed outside the slide 211. The slide 211 is mounted on the base 41. The inner side of the slide 211 is provided with a through groove 215 and a wedge-shaped slide groove 216. The lower surface of the limiting rack 212 protrudes downward to form a wedge-shaped slide 217. The slide 217 extends along the length of the limiting rack 212. One end of the 2 enters the through groove 215 of the slide block 211. The slide bar 217 of the limiting rack 212 is embedded in the slide groove 216 of the slide block 211, and the slide bar 217 can slide along the slide groove 216. The other end of the limiting rack 212 near the steel pipe 42 to be expanded is fixed with the locking claw 22. The gear 213 is placed above the limiting rack 212 and meshes with the limiting rack 212. The output shaft of the motor 214 is connected to the gear 213 for transmission. The limiting pull trolley 21 is powered by the motor 214 to drive the gear 213 inside it to rotate, thereby driving the limiting rack 212 and the locking claw 22 to move in the direction of approaching or away from the steel pipe 42.

[0021] The circulation system includes a conveyor roller 31, a first flipping device 32, and a second flipping device 33. The first flipping device 32 is used to push the mandrel 11 and the top head 12 onto the conveyor roller 31. The conveyor roller 31 is used to transport the mandrel 11 and the top head 12 to the second flipping device 33. The second flipping device 33 is used to push the mandrel 11 and the top head 12 into the receiving trough 18 in front of the tube expanding trolley 14. Specifically, a rotating shaft 34 is provided between the receiving trough 18 and the conveyor roller 31. The first flipping device 32 and the second flipping device 33 are connected to both sides of the rotating shaft 34. Both the first flipping device 32 and the second flipping device 33 are material-pushing hooks. The conveyor roller 31 includes multiple rollers. Both the conveyor roller 31 and the rotating shaft 34 are driven by a motor. The motor driving the rotating shaft 34 is a servo motor. One end of the rotating shaft 34 is connected to the output end of the servo motor through a coupling. When the rotating shaft 34 rotates, it drives the first flipping device 32 and the second flipping device 33 to flip.

[0022] In use, the steel pipe 42 to be expanded is fixed on the workbench by a positioning mechanism. One end of the steel pipe 42 is close to the mandrel 11, and the other end is close to the locking claw 22. First, one end of the steel pipe 42 is heated to above 850°C. Then, this end of the pipe is flared to form a trumpet shape. The entire steel pipe 42 is then heated to 900–1200°C, and the trumpet opening is locked and fixed by the inner claw 16 and the outer claw 15. To improve the strength of the locking point, a cooling water pipe 17 is provided on the outer wall of the trumpet opening for cooling. Figure 3 As shown, before expanding the diameter of the steel pipe 42, the central axes of the mandrel 11 and the mandrel 12 are aligned with the central axis of the steel pipe 42 to be expanded. The expanding trolley 14 pushes the mandrel 11 and the mandrel 12 into the steel pipe 42 through the mandrel 13. The mandrel 12 then presses against the inner wall of the steel pipe 42, and the mandrel 11 extends from the other end of the steel pipe 42, where it is locked by the locking claw 22. After locking the mandrel 11, the limiting-motion pulling trolley 21, powered by the motor 214, drives the internal gear 213 to rotate, thereby causing the limiting rack 212 and the locking claw 22 to move away from the steel pipe 42. Driven by the limiting-motion pulling trolley 21, the limiting rack 212 and the locking claw 22 pull the mandrel 12, whose outer diameter is larger than that of the steel pipe 42, through the steel pipe 42 to be expanded, separating the mandrel 11 from the expanding trolley 14. During this process, the mandrel 12 enters from one end of the steel pipe 42 that forms a flared opening, and then exits from the other end of the steel pipe 42 away from the flared opening, thus expanding the diameter of the steel pipe 42. After the diameter expansion is completed, the mandrel 11 and the mandrel 12 are moved onto the conveyor roller 31 by the first flipping device 32. The conveyor roller 31 then transports the mandrel 11 and the mandrel 12 to the next diameter expansion position. Then, the second flipping device 33 moves the mandrel 11 and the mandrel 12 to the receiving trough 18 in front of the pipe expansion trolley 14, and the pipe expansion trolley 14 pushes it to expand the diameter of the next steel pipe 42.

[0023] The steel pipe hot expansion device designed in this invention patent includes an expansion system, a limiting system, and a circulation system. The entire device is controlled by a mechanical and electrical control system. The hot expansion of the steel pipe 42 is achieved by using a limiting-motion pulling trolley 21. This invention innovates the existing seamless steel pipe hot expansion technology and effectively improves the production efficiency of large-diameter seamless steel pipes.

[0024] Any descriptions not covered in the above specific embodiments of the present invention are known technologies in the field and can be implemented with reference to such known technologies.

[0025] Based on the preferred embodiments of the present invention described above, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A steel pipe thermal expansion device, characterized in that: The system includes a tube expansion system, a movement limiting system, and a circulation system. The tube expansion system includes a mandrel, a mandrel, a push rod, and a tube expansion trolley. A receiving trough for placing the mandrel is provided at the front of the tube expansion trolley. The push rod is installed on the tube expansion trolley. The mandrel is installed at the front end of the mandrel, and the push rod is detachably installed at the rear end of the mandrel. The movement limiting system includes a movement limiting pull trolley and locking claws connected to the movement limiting pull trolley. The locking claws are used to lock one end of the mandrel after the steel pipe is hot expanded. The circulation system includes a conveyor roller conveyor, a first turning device, and a second turning device. The first turning device is used to push the mandrel and mandrel onto the conveyor roller conveyor after the steel pipe is hot expanded. The conveyor roller conveyor is used to transport the mandrel and mandrel to the second turning device. The second turning device is used to push the mandrel and mandrel into the receiving trough in front of the tube expansion trolley. The pipe expansion system also includes an outer clamp and an inner clamp. The receiving trough, the outer clamp, the inner clamp, and the pipe expansion trolley are set on the workbench. The inner clamp and the outer clamp are used to lock and fix the flared mouth formed after the steel pipe is expanded. The limited-motion pulling trolley includes a slide, a gear located inside the slide, a limited-motion rack with one end cooperating with the gear, and a motor installed on the outside of the slide; the slide is set on the base, and the other end of the limited-motion rack near the steel pipe to be expanded is fixed with a locking claw; the gear is placed above the limited-motion rack and meshes with the limited-motion rack, and the output shaft of the motor is connected to the gear drive. The inner side of the slide block is provided with a through groove and a wedge-shaped slide groove. The lower surface of the limiting rack protrudes downward to form a wedge-shaped slide bar. The slide bar extends along the length direction of the limiting rack. One end of the limiting rack enters the through groove of the slide block. The slide bar of the limiting rack is embedded in the slide groove of the slide block, and the slide bar can slide along the slide groove. A rotating shaft is provided between the receiving trough and the conveying roller conveyor. Tilting device one and tilting device two are connected to both sides of the rotating shaft. Both tilting device one and tilting device two are material-pulling hooks. The conveying roller conveyor includes multiple rollers. Both the conveying roller conveyor and the rotating shaft are driven by a motor. The motor that drives the rotating shaft to rotate is a servo motor. One end of the rotating shaft is connected to the output end of the servo motor through a coupling. When the rotating shaft rotates, it drives tilting device one and tilting device two to rotate.

2. The steel pipe thermal expansion device according to claim 1, characterized in that: Cooling water pipes are installed on the outer wall of the flared mouth.

3. The steel pipe thermal expansion device according to claim 1, characterized in that: The top head and the top rod are movably connected. The central axis of the top head and the central axis of the top rod are collinear. The rear end of the top head is provided with a slot, and the end of the top rod away from the tube expanding trolley is inserted into the slot of the top head.

4. The steel pipe thermal expansion device according to claim 1, characterized in that: The diameter of the mandrel is smaller than the inner diameter of the steel pipe to be expanded, and the diameter of the mandrel is larger than the outer diameter of the steel pipe to be expanded.

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